CN104272798B - For being transmitted the method and apparatus of pattern switching in a wireless communication system - Google Patents
For being transmitted the method and apparatus of pattern switching in a wireless communication system Download PDFInfo
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- CN104272798B CN104272798B CN201280071950.2A CN201280071950A CN104272798B CN 104272798 B CN104272798 B CN 104272798B CN 201280071950 A CN201280071950 A CN 201280071950A CN 104272798 B CN104272798 B CN 104272798B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
- H04W72/563—Allocation or scheduling criteria for wireless resources based on priority criteria of the wireless resources
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Abstract
The present invention relates to a kind of for being transmitted the method and apparatus of pattern switching in a wireless communication system.According to one embodiment of present invention, a kind of method for being transmitted pattern switching in a wireless communication system is provided.This method includes：Information of the instruction user equipment for the statistical channel status information of the set of m base station is received, the set of m base station includes 1 candidate cooperative base station of a Reference BTS and m；Calculate the first summation capacity C of the cooperation transmission mode of the set for the m base station1And the second summation capacity C of the non-cooperating transmission mode for each base station in the set of the m base station2, k, wherein k=1 ... m；Based on the first summation capacity C1With the second summation capacity C2, kDetermine downlink transmission mode.The embodiment of the present invention is further to for performing the corresponding base station equipment of corresponding function and computer program product.
Description
Technical field
Present invention relates in general to a kind of communication systems more particularly to one kind to be used to be transmitted in a wireless communication system
The method and apparatus of pattern switching.
Background technology
In wireless communications, due to its provide with conventional a single aerial system compared to the apparent spectrum efficiency promoted with
The ability of link reliability, multiple-input and multiple-output (MIMO) transmission technology of multi-user have been obtained for comparable pass in recent years
Note.It becomes the third generation partner program in long term evolution (LTE)/LTE-Advanced (LTE-A) long term evolution
Key technology used in (3GPP) standard.
In order to improve network capacity and reduce the inter-cell interference between the macro base station of nodes higher deployment density,
There is the network being made of macrocell and low-power and inexpensive node or the mixed form of wireless access point, be referred to as
Heterogeneous network.For HetNet, there are many deployment situations.For example, for indoor scenario, can be less than using its transimission power
100mW and the Femto cell (femtocell) being attached via digital subscriber line (DSL) and macrocell；It can make
It is less than the indoor relaying of 100mW with its transimission power；Using its transimission power less than 100mW and via the high speed of such as optical fiber
Indoor remote radio heads (RRH)/hot-zone of such as indoor femto base station (pico) that backhaul is attached with macrocell
(Hotzone).In outdoor situation, the outdoor relaying with 250mW-2W transimission powers can be used；Can use have
250mW-2W transimission powers and via such as outdoor femto base station that is attached of high speed backhaul and macrocell of such as optical fiber
Outdoor RRH/ hot-zones.In general, such small-sized, low power base station can be referred to as in low power base station, with HetNet
Macro base station is contrasted.
In HetNet, macro base station and (multiple) low power base station at covering edge for being deployed in the macro base station can cooperate with
Operation is to function as equivalent virtual MIMO system.Cooperation has been considered to one kind for alleviating macro base station and low power base station
Between interference problem promising technology.However, for the low power base station close to macro base station or such as RRH node
One of user equipment for, non-cooperating transmission mode typically exhibits capacity more higher than cooperation transmission mode.
It is intended to provide a kind of for so that transmission mode carries out the handover mechanism of alternately variation between cooperation and non-cooperating
With lifting system capacity.
Invention content
In order to solve the problems in the prior art, one or more method and apparatus embodiments according to the present invention are intended to carry
For a kind of solution to improve to some extent for being used to be transmitted pattern switching in a wireless communication system.
According to an aspect of the present invention, the embodiment provides one kind for carrying out in a wireless communication system
The method of transmission mode switching.This method includes：Receive letter of the instruction for the statistical channel status information of the set of m base station
Breath, the set of above-mentioned m base station include a serving BS and m-1 candidate cooperative base station；It calculates for the m base station
First summation capacity C of the cooperation transmission mode of set1And the non-association for each base station in the set of the m base station
Make the second summation capacity C of transmission mode2, k, wherein k=1 ... m；Based on the first summation capacity C1It is total with described second
And capacity C2, kDetermine downlink transmission mode.
According to another embodiment of the invention, the embodiment provides one kind in a wireless communication system
It is transmitted the device of pattern switching.The device includes：Receiving unit is configured as receiving collection of the instruction for m base station
The information of the statistical channel status information of conjunction, the set of above-mentioned m base station include a serving BS and m-1 candidate cooperation base
It stands；Computing unit is configured as calculating the first summation capacity C of the cooperation transmission mode of the set for the m base station1
And the second summation capacity C of the non-cooperating transmission mode for each base station in the set of the m base station2, k, wherein k
=1 ... m；Determination unit is configured as based on the first summation capacity C1With the second summation capacity C2, kUnder determining
DL transmission pattern.
According to the other aspect of the present invention, the embodiment provides the base stations in a kind of wireless communication system.It should
Base station includes the device for being transmitted pattern switching in a wireless communication system according to arbitrary each embodiment of the invention.
According to another embodiment of the invention, the embodiment provides one kind in a wireless communication system
It is transmitted the device of pattern switching.The device includes：For being controlled to receive system of the instruction about the set of m base station
The device of the information of channel state information is counted, the set of above-mentioned m base station includes a serving BS and m-1 candidate cooperation base
It stands；For calculating the first summation capacity C of the cooperation transmission mode of the set for the m base station1And for the m
Second summation capacity C of the non-cooperating transmission mode of each base station in the set of base station2, kDevice, wherein k=1 ... m；
For being based on the first summation capacity C1With the second summation capacity C2, kDetermine the device of downlink transmission mode.
Description of the drawings
The inventive features for being considered as characteristic of the present invention provide in the following claims.However, the present invention, its implementation mould
Formula, other targets, feature and advantage will be by reading the detailed description carried out below with reference to attached drawing to exemplary embodiment
And be better understood, wherein：
Fig. 1 schematically illustrates the wireless communication system that can be implemented within embodiment according to embodiments of the present invention
Example；
Fig. 2 schematically illustrates the operating process of the user equipment in wireless communication system according to embodiments of the present invention
Flow chart；
Fig. 3 diagrammatically illustrates according to embodiments of the present invention for being transmitted pattern switching in a wireless communication system
Method flow chart；
Fig. 4 schematically illustrates the flow chart of the handoff procedure of downlink transmission mode；
Fig. 5 diagrammatically illustrates the block diagram of user equipment according to embodiments of the present invention；
Fig. 6 diagrammatically illustrates the block diagram of base station according to embodiments of the present invention.
Specific embodiment
Then, the embodiment of the present invention is described in refer to the attached drawing.In the following description, it elaborates many specific thin
It saves more fully to understand the present invention.It is apparent, however, to one skilled in the art, that the present invention
Embodiment can be without these details.However, it should be understood that the invention is not limited in such as described here specific
Embodiment.In contrast, any combination of following characteristics and element, which may be considered that, is implemented and puts into practice to the present invention,
Regardless of whether they are related to different embodiments.Therefore, unless being explicitly indicated in other ways in the claims, otherwise with
Under the purpose that is merely to illustrate of aspect, feature, embodiment and advantage, and should not be understood to appended claims will
Element or limitation.
Fig. 1 schematically illustrates the wireless communication system that can be implemented within embodiment according to embodiments of the present invention
Example.
With reference to figure 1, HetNet 100 as shown by macro base station 110 and such as RRH node 120-1,120-2,
At least one low power base station of 120-3,120-4,120-5 are formed.Macro base station 110 and RRH node 120-1,120-2,
120-3,120-4,120-5 can cooperate with each other and be serviced by user equipment of cooperation transmission mode.RRH node 120-
1,120-2,120-3,120-4,120-5 are attached via the backhaul of such as optical fiber with macro base station 110.It should be noted that
Although using example of the RRH node as low power base station, the low-power of one or more embodiment according to the present invention
Base station is not limited to RRH node, but arbitrary appropriate low including femto base station, relay, femto base station etc.
Power base station.
Any generality is not lost, considers wherein user equipment 130 in the situation serviced locally by RRH node 120-1.
The set of candidate cooperative base station can be determined by user equipment 130, including macro base station 110, RRH node 120-2 and 120-
3.The downlink transmission in cooperation transmission mode is shown in Fig. 1.With shifting of the user equipment 130 in HetNet 100
Dynamic, transmission mode can adaptively switch over to obtain relatively high capacity.
With reference to figure 2- Fig. 6, each embodiment of the present invention will be described in detail.
Fig. 2 schematically illustrates the operating process of the user equipment in wireless communication system according to embodiments of the present invention
Flow chart.
In step S210, the signal-to-noise ratio (SNR) received from all base stations is estimated and is based on by user equipment
Estimated SNR determines Reference BTS.
Exemplary embodiment according to the present invention, as shown in Figure 1, all user equipmenies in macrocell can be by same
A macro base station 100 is serviced.In general, each user may be more close with some RRH node and be relatively distant from other RRH and save
Point.Therefore, it closes the RRH node far from user equipment and the useful RRH node of certain quantity is selected to be carried out for user equipment
Service will be advantageous.Θ expressions is enabled to include the set of all base stations of macro base station 110 and all RRH nodes.To being received
SNR, SNRi,Estimated.I-th with maximum reception SNR*A base station is selected as Reference BTS, wherein
In step S220, candidate cooperative base station is obtained based on estimated SNR.
Exemplary embodiment according to the present invention can calculate cooperation factor to determine candidate cooperative base station.Cooperate factor
It can be defined as follows：
With predefined threshold value δ, the set of candidate cooperative base station can be obtained by following
In step S230, the information about statistical channel status information is determined by user equipment and then for example can
It is enough to be reported to base station side via identified Reference BTS.
Assuming that long-time statistical channel state information is updated per N number of time slot, then the transmission correlation matrix energy of user equipment
Enough obtained by following：
WhereinIt is the channel matrix of n-th of time slot.
Exemplary embodiment according to the present invention, the information of instruction statistical channel status information include UT, iAnd ΛT, i, whereinUT, iThe unitary matrice of individual features vector and ΛT, iIt is the diagonal matrix with characteristic value, to pass
Send correlation matrix RT, iCharacteristic value as its diagonal entry.
Indicate that the information of statistical channel status information includes UT, iAnd ΛT, i, then base is reported to via Reference BTS
Side stand to be further processed.
Fig. 3 is schematically shown according to embodiments of the present invention to be cut for being transmitted pattern in a wireless communication system
The flow chart for the method changed.
In step S310, information of the instruction user equipment for the statistical channel status information of the set of m base station is received.
According to an embodiment of the invention, the set of m base station is connect via respective user equipment according to from all base stations
The signal of receipts is determined and can be including such as i-th*One Reference BTS of a base station and m-1 candidate cooperation base
It stands, the set Φ of the candidate cooperative base station such as obtained.User equipment calculates instruction for the set of identified m base station
The information of statistical channel status information can be calculated and for example be reported to base station side via its Reference BTS.Root
According to exemplary embodiment of the present invention, the information of instruction statistical channel status information includes UT, iAnd ΛT, i, wherein transmitting Correlation Moment
Battle arrayUT, iThe unitary matrice of individual features vector and ΛT, iIt is pair using characteristic value as its diagonal entry
Diagonal matrices.
In certain embodiments of the present invention, all involved base stations all carry out mutually via the backhaul of such as optical fiber
It interconnects to exchange information.It can be assumed that all calculating of base station side as described herein are all handled by virtual center
Performed by device, wherein at least part computing capability of all involved base stations can be integrated.Hereafter, term " central processing unit "
It is used to refer to the computing capability of base station.
In step s 320, the first summation capacity C of the cooperation transmission mode of the set for m base station is calculated1And
For the second summation capacity C of the non-cooperating transmission mode of each base station in the set of the m base station2, k, wherein k=
1 ... m.
For cooperation transmission mode, the set of m base station is worked and synergistically transmits number to user equipment jointly
According to symbol.In general, user equipment can obtain intact channel state information, and base station can only obtain instruction statistical channel shape
The information of state information and the information swapped between those base stations.
Traversal summation capacity based on the instantaneous channel state information in downlink system can be represented as：
Wherein ΓiRepresent maximum-norm attenuation, PiRepresent the delivering power of i-th of base station,It represents from i-th
Base station to user equipment small-scale mimo channel decay vector,Represent that selected Wave beam forming prelists code vector
Amount, E { } represent all expectation of a random variables being directed in bracket, | | then represent the magnitude of scalar.
Follow Jensen inequality, equation 5) it can be represented as
Due to item hiwiFor scalar, 6) institute can further be represented as in equation：
Under conditions of only knowing statistical channel status information in base station, optimal beam forming device that user equipment is used for transmission
It is RT, iPrincipal eigenvector, i.e.,
wi=uI, 1, i=1,2 ..., m 8)
Wherein uI, 1It represents to correspond to transmission correlation matrix RT, iMaximum eigenvalue λT, i, 1Characteristic vector, correspond to
Maximum eigenvalue λT, i, 1Unitary matrice UT, iRow.
Can be by by equation 8) it substitutes into 7) traversal summation capacity is simplified, that is,
Due to unitary matrice UT, iRow it is mutually orthogonal, so according to an embodiment of the invention, the first summation capacity C1By with
Under calculated
Wherein i ∈ { 1,2 ... m } represent i-th of base station in the set of the m base station, ΓiExpression declines on a large scale
Subtract, PiRepresent the delivering power of i-th of base station, λT, i, 1Represent transmission correlation matrix RT, iMaximum eigenvalue, can be from being connect
The information of the instruction statistical channel status information of receipts and obtain.
Therefore it can be seen that for cooperation transmission mode can merely with instruction statistical channel status information information and
The traversal summation capacity of downlink system is carried out approximate.
For non-cooperating transmission mode, the set of m base station respectively services the user equipment of their own, and
There is interference between base station.In general, user equipment can obtain intact channel state information, and base station then can only be referred to
Show the information of statistical channel status information.When user equipment is serviced by k-th of base station, based in downlink system
The traversal summation capacity of instantaneous channel state information can be represented as
Wherein k=1 ..., m, ΓiRepresent extensive attenuation, PiRepresent the delivering power of i-th of base station,
Represent the small-scale mimo channel decay vector from i-th of base station to user equipment,Represent selected wave beam
Precoding vectors are formed, E { } is represented about all expectation of a random variables in bracket, | | then represent the amount of scalar
Grade.
Follow Jensen inequality andWherein X and Y is the continuous random variable of real value, equation
11) can be by approximate expression：
Due to item hiwiFor scalar, 12) institute can further be represented as in equation：
Can be by by equation 8) it substitutes into 13) traversal summation capacity is simplified, that is,
Due to unitary matrice UT, iRow it is mutually orthogonal, so according to an embodiment of the invention, the second summation capacity C2, kPass through
It is calculated below
Wherein i ∈ { 1,2 ... m } represent i-th of base station in the set of the m base station, ΓiExpression declines on a large scale
Subtract, PiRepresent the delivering power of i-th of base station, λT, i, 1Represent transmission correlation matrix RT, iMaximum eigenvalue, can be from being connect
The information of the instruction statistical channel status information of receipts and obtain.
It therefore it can be seen that can be merely with the information of instruction statistical channel status information for non-cooperating transmission mode
And the traversal summation capacity of downlink system is carried out approximate.
In step S330, based on the first summation capacity C1With the second summation capacity C2, kDetermine the downlink of user equipment
Transmission mode.Determining the detailed process of the downlink transmission mode of user equipment will provide with reference to figure 4.
Fig. 4 schematically illustrates the flow chart of the handoff procedure of downlink transmission mode.
In step S400, the handoff procedure of downlink transmission mode based on statistical channel status information in response to being obtained
First summation capacity C1With the second summation capacity C2, kAnd start.
In step S410, by the first summation capacity C1With the second summation capacity C2, kMaximum value be compared.
In step S420, the first summation capacity C is determined1Whether the second summation capacity C is more than2, kMaximum value.
If the definitive result in step S420 is "Yes", i.e. the first summation capacity C1More than the second summation capacity C2, k's
Maximum value, the then processing of handoff procedure are carried out using step S430-S433.Otherwise, the processing of handoff procedure utilizes step S440-
S443 is carried out.
In step S430, the central processing unit of base station side determines the use of cooperation transmission mode.
In step S431, determine whether current transmission mode is cooperation transmission mode.
If definitive result in step S431 is "Yes", current transmission mode remains unchanged and cooperative base station and use
Family equipment continues to execute coordination downlink link transmission.
If the definitive result in step S431 is "No", in step S433, transmission mode is switched to cooperation transmission
Pattern, the set of wherein m base station work collaboratively to transmit down link data symbol to user equipment jointly.
In step S440, the central processing unit of base station side is determined using non-cooperating transmission mode.
In step S441, determine whether current transmission mode is non-cooperating transmission mode.
If the definitive result in step S441 is "Yes", current transmission mode remains unchanged and the place of handoff procedure
Reason is carried out to step S442.
If the definitive result in step S441 is "No", in step S443, transmission mode is switched to non-cooperating biography
The processing of defeated pattern and handoff procedure is carried out to step S442.
In step S442, kth is selected based on the second summation capacity*A appropriate serving BS.
According to an embodiment of the invention, kth can be selected from the set of m base station by following*A serving BS
According to another embodiment of the invention, kth*It is identified i-th that a serving BS, which can be selected directly,*It is a
Reference BTS.
In non-cooperating transmission mode, selected kth*A base station is as the serving BS of user equipment to perform downlink
Link transmission.
According to the one or more embodiments more than present invention, transmission mode can be according to based on from respective user equipment institute
Capacity analysis result that the information of the instruction statistical channel status information of report is carried out and adaptively in two kinds of transmission modes
Switched between cooperation transmission mode and non-cooperating transmission mode.It is changed earnestly really using based on instantaneous channel state information
Method can have comparable system capacity performance according to the adaptive handover scheme of each embodiment of the present invention, but have
Relatively high availability and efficiency.
Processing by reference to Fig. 2 and 4 pair of one or more embodiment according to the present invention is described.It should be noted that
, above description is only exemplary and is not intended to and limits the invention.In other embodiments of the invention, should
Method can have more or less or different steps, and the number to step progress is merely to so that describe more
It is concise and clearly more clear, and the sequence not between each step is strictly limited；The sequence of step may simultaneously
It is different with describing.For example, in some embodiments, more than one or more optional steps can be omitted.Each step
Rapid specific embodiment can be different with description.All these variations are both fallen within the spirit and scope of the present invention.
Fig. 5 schematically shows the simplified block diagram of user equipment according to embodiments of the present invention.
In general, each embodiment of UE 500 can include but is not limited to cellular phone, have wireless communication ability
PDA, the pocket computer with wireless communication ability, image capture device (such as digital phase with wireless communication ability
Machine), there is the game station of wireless communication ability and the portable unit or terminal of combination comprising these functions.
UE 500 is suitable for communicating with one or more base stations in a wireless communication system via its aerial array 550.
UE 500 include data processor (DP) 510, be coupled to/be embedded into DP 510 memory (MEM) 520 and
Aerial array 550 is coupled to the appropriate RF transmitters TX/ receivers RX 540 of DP 510.RF TX/RX modules 540 be used for
At least one base station carries out two-way wireless communication.MEM 520 stores program (PROG) 530.
PROG 530 is believed to comprise program instruction, and UE 500 is enabled to when program instruction is performed by DP 510 with root
It is operated according to exemplary embodiment of the invention, as discussed herein the operating process of user equipment as shown in Figure 2.
MEM 520 can have any type for being suitable for local technical environment and can utilize any suitable data
Memory technology is realized, as non-limiting example, these data storage technologies are, for example, storage device based on semiconductor, magnetic
Storage device and system, light storage device and system, fixed memory and removable memory.Although only show in UE 500
Go out a MEM, but there may be several physically different memory cells in UE 500.
DP 510 performs arbitrary required calculating as described with reference to figure 2.DP 510 can be any is suitable for originally
The type of ground technological accumulation and inheritance, and as non-limiting example, it can include one or more all-purpose computers, dedicated computing
Machine, microprocessor, DSP and the processor based on multi-core processor framework.
User equipment 500 includes reporting unit (being not shown in Fig. 5).This report unit is configured as setting to for the user
The standby information of base station report instruction statistic channel information serviced, there is feedback information wherein.It can appreciate that, it should
The function of reporting unit can be implemented by the appropriate module of one or more of user equipment 500 as described above.
Show to the schematic property of Fig. 6 the simplified block diagram of base station according to embodiments of the present invention.
Base station 600 is suitable for communicating with user equipment in a wireless communication system.As previously discussed, base station 600
Can be macro base station (for example, macro eNB) or low power base station (for example, RRH node, femto base station, relay, femto
Base station etc.).
Base station 600 include data processor (DP) 610, be coupled to/be embedded into DP 610 memory (MEM) 620 and
Aerial array 650 is coupled to the appropriate RF transmitters TX/ receivers RX 640 of DP 610.RF TX/RX modules 640 be used for
At least one UE carries out two-way wireless communication.MEM 620 stores program (PROG) 630.
PROG 630 is believed to comprise program instruction, enabled to when program instruction is performed by DP 610 base station 600 with
It is operated according to exemplary embodiment of the invention, as discussed herein operating process as shown in Figures 3 and 4.
MEM 620 can have any type for being suitable for local technical environment and can utilize any suitable data
Memory technology is realized, as non-limiting example, these data storage technologies are, for example, storage device based on semiconductor, magnetic
Storage device and system, light storage device and system, fixed memory and removable memory.Although only in the station 600
One MEM is shown, but there may be several physically different memory cells in the station 600.
DP 610 performs arbitrary required calculating as described with reference to Figure 4.DP 610 can be any is suitable for originally
The type of ground technological accumulation and inheritance, and as non-limiting example, it can include one or more all-purpose computers, dedicated computing
Machine, microprocessor, DSP and the processor based on multi-core processor framework.
Base station 600 includes receiving unit, computing unit and determination unit (being not shown in Fig. 6).The receiving unit is configured
To receive system of the instruction user equipment for the set of m base station from another base station in user equipment or wireless communication system
The information of channel state information is counted, above-mentioned set includes a Reference BTS and m-1 candidate cooperative base station.The computing unit quilt
It is configured to calculate the first summation capacity C of the cooperation transmission mode of the set for the m base station1And for the m
Second summation capacity C of the non-cooperating transmission mode of each base station in the set of base station2, k, wherein k=1 ... m.This is determined
Unit is configured as based on the first summation capacity C1With the second summation capacity C2, kDetermine downlink transmission mode.It can realize
To, the function of the receiving unit, computing unit and determination unit can by one of base station 600 as described above or
Multiple appropriate modules are implemented.
In general, each embodiment can be realized with hardware or special circuit, software, logic or a combination thereof.Example
Such as, some aspects can be implemented with hardware, and other aspects can with firmware either can by controller, microcontroller or
Software performed by other computing devices is implemented, although the present invention is not limited thereto.Although the exemplary embodiment party of the present invention
The various aspects of formula can be shown and be described as block diagram and signaling diagram, it should also be appreciated that it is described herein these
Frame, device, system, technology or method can be implemented in the hardware as non-limiting example, software, firmware, Special electric
Road or logic, common hardware or controller or other computing devices or its certain combination.
Thus, it should be appreciated that at least some of aspect of exemplary embodiments of the present invention can be come real with various assemblies
It is existing, such as IC chip and module.As is known in the art, the design of integrated circuit is generally increasingly automated
Process.
The present invention can also realize with computer program product, institute including that can realize method as described herein
There is feature and this method can be realized when being loaded into computer system.
It is specifically illustrated in reference to preferred embodiment and illustrates the present invention.Those skilled in the art should manage
Solution can in form and details carry out the present invention various changes without departing from the spirit and scope of the present invention.
Claims (14)
1. a kind of method for being transmitted pattern switching in a wireless communication system, including：
The information of the statistical channel status information of the set for m base station of instruction user equipment is received, the m base station
Set includes a Reference BTS and m-1 candidate cooperative base station；
Calculate the first summation capacity C of the cooperation transmission mode of the set for the m base station1And for the m base station
Set in each base station non-cooperating transmission mode the second summation capacity C2,k, wherein k=1 ... m；
Based on the first summation capacity C1With the second summation capacity C2,kDetermine downlink transmission mode；
Wherein described first summation capacity C1It is calculated by following formula
Wherein i ∈ { 1,2 ... m } represent i-th of base station in the set of the m base station, ΓiRepresent extensive attenuation, PiTable
Show the delivering power of i-th of base station, λt,i,1Represent transmission correlation matrix Rt,iMaximum eigenvalue；
Wherein described second summation capacity C2,kIt is calculated by following formula
Wherein i ∈ { 1,2 ... m } represent i-th of base station in the set of the m base station, ΓiRepresent extensive attenuation, PiTable
Show the delivering power of i-th of base station, λt,i,1Represent transmission correlation matrix Rt,iMaximum eigenvalue.
2. the method according to claim 1, wherein
Indicate that the described information of statistical channel status information includes Ut,iAnd Λt,i, whereinUtiIt is corresponding spy
Levy the unitary matrice of vector, and ΛtiIt is the diagonal matrix using characteristic value as its diagonal entry.
3. the method according to claim 1, including
In response to determining C1More than C2,kMaximum value, wherein k=1 ..., m, determine the downlink transmission of the user equipment by
The set cooperation of the m base station performs.
4. the method according to claim 1, including
In response to determining C1Less than C2,k,It determines
The downlink transmission of the user equipment is by kth*Performed by a base station, meet
Or
The downlink transmission of the user equipment is as performed by the Reference BTS.
5. the method according to claim 1, wherein
The wireless communication system is the isomery for including at least one macro base station and at least one remote radio heads node
Network.
6. it is a kind of for being transmitted the device of pattern switching in a wireless communication system, including：
Receiving unit is configured as receiving the statistical channel status information of the set for m base station of instruction user equipment
Information, the set of the m base station include a Reference BTS and m-1 candidate cooperative base station；
Computing unit is configured as calculating the first summation capacity C of the cooperation transmission mode of the set for the m base station1With
And the second summation capacity C of the non-cooperating transmission mode for each base station in the set of the m base station2,k, wherein k=
1,…m；
Determination unit is configured as based on the first summation capacity C1With the second summation capacity C2,kDetermine that downlink passes
Defeated pattern；
Wherein described computing unit is configured as calculating the first summation capacity C by following formula1
Wherein i ∈ { 1,2 ... m } represent i-th of base station in the set of the m base station, ΓiRepresent extensive attenuation, PiTable
Show the delivering power of i-th of base station, λt,i,1Represent transmission correlation matrix Rt,iMaximum eigenvalue；
Wherein described computing unit is configured as calculating the second summation capacity C by following formula2,k
Wherein i ∈ { 1,2 ... m } represent i-th of base station in the set of the m base station, ΓiRepresent extensive attenuation, PiTable
Show the delivering power of i-th of base station, λt,i,1Represent transmission correlation matrix Rt,iMaximum eigenvalue.
7. device according to claim 6, wherein
Indicate that the described information of statistical channel status information includes Ut,iAnd Λt,i, whereinUt,iIt is corresponding spy
Levy the unitary matrice of vector, and Λt,iIt is the diagonal matrix using characteristic value as its diagonal entry.
8. device according to claim 6, wherein
The determination unit is configured to respond to determine C1More than C2,kMaximum value, wherein k=1 ..., m determine the user
The downlink transmission of equipment is cooperated by the set of the m base station and performed.
9. device according to claim 6, wherein
The determination unit is configured to respond to determine C1Less than C2,k,It determines
The downlink transmission of the user equipment is by kth*Performed by a base station, meet
Or
The downlink transmission of the user equipment is as performed by the Reference BTS.
10. device according to claim 6, wherein
The wireless communication system is the isomery for including at least one macro base station and at least one remote radio heads node
Network.
11. a kind of base station in wireless communication system, including being wirelessly communicated according to any one of claim 6-10
The device of pattern switching is transmitted in system.
12. base station according to claim 11, wherein the base station is macro base station.
13. base station according to claim 11, wherein the base station is remote radio heads node.
14. it is a kind of for being transmitted the device of pattern switching in a wireless communication system, including：
For being controlled with the information of the statistical channel status information of the set for m base station of reception instruction user equipment
Device, the set of the m base station includes a Reference BTS and m-1 candidate cooperative base station；
For calculating the first summation capacity C of the cooperation transmission mode of the set for the m base station1And for the m
Second summation capacity C of the non-cooperating transmission mode of each base station in the set of base station2,kDevice, wherein k=1 ... m；
For being based on the first summation capacity C1With the second summation capacity C2,kDetermine the device of downlink transmission mode；
Wherein described first summation capacity C1It is calculated by following formula
Wherein i ∈ { 1,2 ... m } represent i-th of base station in the set of the m base station, ΓiRepresent extensive attenuation, PiTable
Show the delivering power of i-th of base station, λt,i,1Represent transmission correlation matrix Rt,iMaximum eigenvalue；
Wherein described second summation capacity C2,kIt is calculated by following formula
Wherein i ∈ { 1,2 ... m } represent i-th of base station in the set of the m base station, ΓiRepresent extensive attenuation, PiTable
Show the delivering power of i-th of base station, λt,i,1Represent transmission correlation matrix Rt,iMaximum eigenvalue.
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| PCT/CN2012/078701 WO2014012206A1 (en) | 2012-07-16 | 2012-07-16 | Method and apparatus for transmission mode switching in a wireless communication system |
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| CN102098091A (en) * | 2011-01-10 | 2011-06-15 | 东南大学 | Self-adaptive switching method of multi-cell cooperative downward transmission modes |
| CN102113384A (en) * | 2008-07-30 | 2011-06-29 | 株式会社日立制作所 | Radio communication system and radio communication method |
| WO2011152347A1 (en) * | 2010-06-04 | 2011-12-08 | シャープ株式会社 | Communication system and communication method |
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| CN102113384A (en) * | 2008-07-30 | 2011-06-29 | 株式会社日立制作所 | Radio communication system and radio communication method |
| WO2011152347A1 (en) * | 2010-06-04 | 2011-12-08 | シャープ株式会社 | Communication system and communication method |
| CN102098091A (en) * | 2011-01-10 | 2011-06-15 | 东南大学 | Self-adaptive switching method of multi-cell cooperative downward transmission modes |
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